Fitch Ratings has revised the outlook of UBS Group AG (UBS) , UBS AG's and UBS Switzerland AG to Positive from Stable.  UBS's long-term Issuer Default Rating (IDR) has been affirmed at 'A,' while UBS AG's and UBS Switzerland AG's have been affirmed at 'A+.’ This upgrade reflects Fitch’s expectation that UBS’s well-advanced integration of Credit Suisse ("CS") will continue to reduce execution risks while improving profitability.Rationale Behind UBS’s Rating UpgradeExecution Risk Declining: Fitch expects UBS’ ...